Platon Sudoku · Sudoku Study

Assumptions · Core Concepts

An assumption temporarily treats an unresolved candidate as true to explore consequences. It is not a placed answer.

This course is adapted from Platon Sudoku App. Read the complete example here, then continue learning and practising in the app.

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Definition

An assumption temporarily treats an unresolved candidate as true to explore consequences. It is not a placed answer.

How to find it

Choose a real candidate and record only consequences that follow from that temporary state.

Common mistake

Do not treat an assumption as confirmed. Conclusions need contradiction or agreement across branches.

Worked example

Teaching board · local candidate diagram

Observe candidates

An assumption temporarily treats an unresolved candidate as true to explore consequences. It is not a placed answer.

The small 2 at r2c2 is still a candidate; assuming it true explores consequences without placing it.

Verify the condition

Choose a real candidate and record only consequences that follow from that temporary state.

The small 2 at r2c2 is still a candidate; assuming it true explores consequences without placing it.

Draw the conclusion

The marked 2 is unresolved; assume it true temporarily and trace that branch.

The small 2 at r2c2 is still a candidate; assuming it true explores consequences without placing it.

Recognition practice

Teaching board · local candidate diagram

Recognition practice 1

Is the highlighted digit still a candidate that can be assumed, rather than a placed answer?

Teaching board · local candidate diagram

Draw the conclusion

Yes

Recognition practice 2

Is the highlighted digit still a candidate that can be assumed, rather than a placed answer?

Teaching board · local candidate diagram

Draw the conclusion

No

Recognition practice 3

Is the highlighted digit still a candidate that can be assumed, rather than a placed answer?

Teaching board · local candidate diagram

Draw the conclusion

Yes

Recognition practice 4

Is the highlighted digit still a candidate that can be assumed, rather than a placed answer?

Teaching board · local candidate diagram

Draw the conclusion

No

Recognition practice 5

Is the highlighted digit still a candidate that can be assumed, rather than a placed answer?

Teaching board · local candidate diagram

Draw the conclusion

Yes

Recognition practice 6

Is the highlighted digit still a candidate that can be assumed, rather than a placed answer?

Teaching board · local candidate diagram

Draw the conclusion

No

Recognition practice 7

Is the highlighted digit still a candidate that can be assumed, rather than a placed answer?

Teaching board · local candidate diagram

Draw the conclusion

Yes

Recognition practice 8

Is the highlighted digit still a candidate that can be assumed, rather than a placed answer?

Teaching board · local candidate diagram

Draw the conclusion

No

Recognition practice 9

Is the highlighted digit still a candidate that can be assumed, rather than a placed answer?

Teaching board · local candidate diagram

Draw the conclusion

Yes

Recognition practice 10

Is the highlighted digit still a candidate that can be assumed, rather than a placed answer?

Teaching board · local candidate diagram

Draw the conclusion

No

Recognition practice 11

Is the highlighted digit still a candidate that can be assumed, rather than a placed answer?

Teaching board · local candidate diagram

Draw the conclusion

Yes

Recognition practice 12

Is the highlighted digit still a candidate that can be assumed, rather than a placed answer?

Teaching board · local candidate diagram

Draw the conclusion

No

Practice

This course is adapted from Platon Sudoku App. Read the complete example here, then continue learning and practising in the app.

View on Google Play